backlighting

The fluorescent lamps for backlighting have made progress in technology with the development of liquid crystal display.

随着液晶显示的发展，背光照明用荧光灯取得了技术进步。

In the condition of that when the light is insufficient (such as in the cloudy day or in the night), we can meet the backlighting problem.

在自然光线不足（阴雨、夜晚）的逆光情况下，要得到较为理想的车牌图像，需要进行人工补光。